I have generally used a combined approach which made since with older
versions of Protel, and is a little more difficult with newer.
Older versions of Protel had two spacings, one for large components and the
other for small. I made the small components like 0805 parts so the
silkscreen would overlap and form one 10 mil line at the proper
spacing, and large components had a spacing from their outmost pad or
silkscreen. This worked good for me. This was useful since it is
hard to draw an outline for a small part unless it is on the edge of
the placement area, and some large parts can look strange with a lot
of silkscreen around them.
With the current version of Protel I will create a class for small
components and a class for large to do the same thing. Then I can
create rules to set the proper spacing for all the different types of
parts.
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